When was the Huang He returned to its northern course after the 1938 diversion?

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Map of eastern Asia highlighting the province of Henan in central China in orange, with its capital Zhengzhou labeled. Surrounding countries and major international boundaries are shown, along with a small inset map locating Henan within all of China. — Henan Henan province, China.

The Huang He was restored to its former northern course in 1947, following the deliberate 1938 diversion that had been executed to impede the Japanese military advance during the Sino-Japanese War. The dikes, which had been destroyed near Zhengzhou to cause the flooding, were rebuilt between 1946 and 1947 to facilitate the river's return to its original path toward the Bo Hai.12